摘要
通过对门楼水库溢流坝段不同位置、不同深度、不同岩石风化程度在不同混凝土强度和不同含水率情况下近百块试块的室内直剪试验,研究了岩石和混凝土胶结面的抗剪强度与混凝土强度、岩石的风化破碎程度和含水率的关系。结果表明,混凝土的强度对胶结面的抗剪强度具有明显的影响;对于块状及次块状结构类型岩体,胶结面抗剪强度参数基本相同,但裂隙块体强度降低很多,部分块体破坏形态已不在是沿胶结面破坏,而是部分迁就胶合面,部分追随岩体内的结构面,并形成较大的起伏;随着含水率的增加,凝聚力和内摩擦角都明显降低。试块的抗剪强度只代表试验点的强度,为了得到建基面的抗剪强度,将岩石和混凝土的抗剪强度看作随机变量,引入区域化内变量和变异函数反映抗剪强度的随机性和结构性,通过克里格方程求得各个样本的权值,进而求出不同建基面的抗剪参数。
Based on nearly 100 test specimens from different locations,different depths and different degrees of weathering,under the conditions of different concrete strengths and different water contents,the direct shear.tests have been done.The relation among shearing strength of rock and concrete strength,weathering degree and water content have been studied.The test results show that the concrete strength affects the shearing strength of rock and concrete greatly.The contact shear strength is nearly equal to that of massive structure and sub-massive structure,and thear strength values reduce greatly to that of clastic structure and inter locked structure.The cracking location is not contact area of rock and concrete but partial contact plane and partial structural plane.With the water content increases,the cohesion force and inter-friction degree decreases.Laboratory shear test results only reflect the location of specimens.To gain the contact plane shearing strength,the cohesion force and inter-friction degree is looked as stochastic variables.Regionalized variable and variogram are introduced to represent the rock randomness and structure.Kriging equation is used to calculate weight values of test specimens.At last,the shearings strength of rock and concrete are obtained by statistical method.
作者
杨令强
李园园
林明强
YANG Ling-qiang;LI Yuan-yuan;LIN Ming-qiang(College of Civil Engineering and Architecture,Jinan University,Jinan 250022,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第S01期515-518,共4页
Rock and Soil Mechanics
关键词
岩石与混凝土
直剪试验
抗剪强度
门楼水库
direct shear test
rock and concrete
shearing strength of rock and concrete
Menlou Reservoir
